Chapter 4 Questions (STAT-200)

Chapter 4 Questions (STAT-200) - Tommy Y. Choi STAT-200 OL1...

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Tommy Y. Choi STAT-200 OL1 Chapter 4-2 Questions: 14) Identifying Probability Values a) What is the probability of an event that is certain to occur? b) What is the probability of an impossible event? c) A sample space consists of 10 separate events that are equally likely. What is the probability of each? d) On a true/false test, what is the probability of answering a question correctly if you make a random guess? e) On a multiple-choice test with five possible answers for each question, what is the probability of answering a question correctly if you make a random guess? a) Certain To Occur : 1 b) Impossible Event : 0 c) 1 / 10 = 0.1 10% d) 1 / 2 = 0.5 50% e) 1 / 5 = 0.2 20% 28) Using probability to Identify Unusual Events: Consider an event to be “unusual” if its probability is less than or equal to 0.05. (This is equivalent to the same criterion commonly used in inferential statistics, but the value of 0.05 is not absolutely rigid, and other values such as 0.01 are sometimes used instead.) a) Bumped From A Flight: Among 15,378 Delta airline passengers randomly selected, 3 were bumped from a flight against their wishes (Based on data from the U.S. Department of Transportation). Find the probability that a randomly selected passenger is involuntarily bumped. Is such bumping unusual? Does such bumping pose a serious problem for Delta passengers in general? Why or why not? a) Probability : 0.000195 a. 3 / 15,378 b. Being bumped off a flight on Delta is unusual since the probability of 0.000195< 0.05. As a Delta passenger, it is not a serious problem being bumped off your flight since the event is unusual and will probably not occur.
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Tommy Y. Choi STAT-200 OL1 Chapter 4-3 Questions 4) Addition: When analyzing results from a test of the Microsort gender
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This note was uploaded on 10/03/2010 for the course STAT 200 taught by Professor Hirschorn during the Fall '10 term at University of Maryland Eastern Shore.

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Chapter 4 Questions (STAT-200) - Tommy Y. Choi STAT-200 OL1...

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